KR870003015A - Anaerobic treatment of high strength liquid - Google Patents

Abstract

A process for the treatment of high strengfh BOD containing liquors (1) involves mildly mixing and contacting the liquors with anaerobic bacteria (2) and a powdered adsorbent support medium (4), such as activated carbon, to remove a substantial portion of the organic matter and generate a methane fuel gas (3). Use of the powdered support medium at 0.1-20 g/l enables high removal of BOD in short treatment times of 72 hours or less, rapid clarification of treated liquors, and increased adsorbability of liquor colour. The biomass and adsorbent support medium (8) is separated from the digested liquor (7) and at least part (9) thereof is returned to the anaerobic digester (2). Another part (11) may be treated to regenerate the support medium (13) for re-use. The digested liquor (7) may be further contacted with reduced concentrations of powdered colour adsorbent (15), which may also be activated carbon, to produce a treated liquor (18) low in dissolved organic matter and colour, and the spent powdered colour adsorbent (19) is preferably regenerated (37) and re-used.

Description

Anaerobic treatment of high strength liquid

Since this is an open matter, no full text was included.

1 is a process chart according to the present invention.

2 is a process diagram in which the adsorption regeneration step is added to the process of the present invention.

3 is a process chart adding an organic material and a pigment removing step.

Claims (58)

(a) Removes almost all of the BOD in a mixed anaerobic digestion atmosphere with a high-strength BOD-containing liquid consisting of viable conditional pre-forming bacteria and methane-producing bacteria that can survive with adsorbent powder support and moderated for 4 to 72 hours Mixed and contacted with methane fuel gas to generate additional conditional acid-forming bacteria and methane producing bacteria, (b) separating and recovering the methane fuel gas from the mixture of the digested liquid, the cells and the adsorbent support medium; (c) separating the cells and the adsorptive support medium by gravity from the digested liquid so that sludges of the digested clarifying liquid and the cells and the adsorptive support medium are formed; (d) discharging the digested clarifying liquid to the natural environment or discharging it to the next stage for reuse or subsequent processing; (e) continuously or intermittently recycling some or all of the sludge in the mixing and contacting step (a) to treat the additional amount of high strength BOD containing liquid, (f) a high-strength BOD comprising intermittently or continuously adding a finely adsorbent powder support medium to the mixture of liquid, cells and support medium in step (a) so that the loss of the support medium is compensated for during the treatment process. Treatment method of containing liquid. The method of claim 1, Wherein at least 25% of the adsorptive powder support media consists of particles of 0.01 to 0.3 mm in diameter. The method of claim 1, Wherein at least 25% of the adsorptive powder support media consists of particles of 0.01 to 0.2 mm in diameter. The method of claim 1, Adsorbent powder support medium comprising one or more fly ash, table photo, diatom, polymerizable material, charcoal or activated carbon. The method of claim 1, and a support medium, 0.1 to about 20 g / ι, in the mixture of liquid, cells and adsorbent component support medium of step (a). The method of claim 1, BOD 500 to 100,000mg / ι contained in the high-strength liquid. The method of claim 1, Method characterized in that the high strength liquid contains COD 700 to 160,000mg / ι. The method of claim 1, wherein the high-strength liquid is mixed and contacted with the cells and the support medium of step (a) for 4 to 48 hours. The method of claim 1, The high-strength liquid is mixed and contacted with the cells and the support medium of step (a) at a loading rate of 0.1 to 45 kg BOD / kg cells per day. The method of claim 1, The high-strength liquid is mixed and contacted with the cells and the support medium of step (a) at a loading rate of 0.1 to 11.0 kg COD / kg cells per day. The method of claim 1, A high strength BOD-containing liquid is produced from a heating process such as heat treatment or wet oxidation of sludge or industrial waste. The method of claim 1, the amount of soluble BOD removed in step (a) is greater than 50%. The method of claim 1, The amount of soluble BOD removed in step (a) is greater than 80%. The method of claim 1, the amount of soluble BOD removed in step (a) is greater than 90%. The method of claim 1, A process characterized in that the process is operated in a continuous or semi-continuous manner. The method of claim 1, Mixing and contacting the mixture of the cells and the adsorbent support medium in step (c), the cells are destroyed and the support medium is recycled, and the regenerated adsorbent support medium is treated to handle the addition of high strength BOD-containing liquid. The method further comprises the step of returning to step (a). The method of claim 16, A method characterized in that the regeneration process is carried out by wet oxidation. The method of claim 16, The regeneration process is carried out by combustion in a furnace controlled atmosphere. The method of claim 1, (g) contacting the digested clarifying liquid from step (d) with a pigment adsorbent for pigment removal, (h) separating the dye adsorbed dye adsorbent from the decolorized clarification liquid, and (i) discharging the bleached clarifying liquid from step (h) to the natural environment or to the next stage for reuse or subsequent treatment. The method of claim 19, The contacting step (g) comprises mixing and contacting the digested clarifying liquid from step (d) with 0.1 to 20 g / ι of the pigment adsorbent for 0.2 to 4 hours. The method of claim 19, Wherein the pigment adsorbent consists of a table photo, diatom, polymeric material, charcoal or activated carbon in one or more plies. The method of claim 19, At least 25% of the dye adsorbent is a powder consisting of particles having a diameter of 0.1 to 0.3 mm. The method of claim 19, (h) adding some or all of the used dye adsorbent from step (h) to the mixing and contacting step (a) to treat the additional amount of high strength BOD containing liquid. The method of claim 19, introducing part or all of the used dye adsorbent from step (h) into the regeneration process step of regenerating the used dye adsorbent and contacting the regenerated dye adsorbent to remove the pigment from the additional amount of digested clarifying liquid (g) further comprising the step of returning. The method of claim 19, A part or all of the used dye adsorbent from step (h) is introduced into the regeneration process step of regenerating the used dye adsorbent and the part or all of the regenerated dye adsorbent is mixed to treat the high strength BOD-containing liquid addition amount. And counteracting with contacting step (a). (a) High strength BOD-containing colored liquids with viable cells consisting of viable conditional acid-forming bacteria and methane-producing bacteria, together with powdered activated carbon such as an adsorbent support medium, and nearly the BOD in a mild mixed anaerobic digestion atmosphere for 4 to 72 hours. All are removed and mixed and contacted with methane fuel gas to generate additional conditional acid-forming bacteria and methanogenic bacteria, (b) separating and recovering fuel gas from the mixture of the digested liquid, cells and powdered activated carbon, (c) separating the cells and powdered activated carbon from the digested liquid to form a sludge of the digested clarifying liquid and the cells and powdered activated carbon; (d) part of the sludge is continuously or intermittently recycled to the mixing and contacting step (a) to treat an additional amount of high strength BOD-containing colored liquid addition; (e) contacting the digested clarified liquid from step (c) with an additional amount of powdered activated carbon to decolorize the digested clarified liquid by adsorption of the pigment and formation of the used dye adsorbent, (f) separating the used dye adsorbent from the clarifying liquid degassed in the second clarification step, (g) discharging the decolorized clarifying liquid which has passed through the second clarification step to the natural environment or discharged for reuse or subsequent treatment, (h) a portion of the slurry from clarification step (c) is passed through a regeneration step that destroys the cells and regenerates them into powdered activated carbon in the sludge; (i) the recycled powdered activated carbon is recycled to the anaerobic mixing and contacting step (a) to treat the addition amount of the BOD containing colored liquid, (j) at least a portion of the used dye adsorbent separated from the clarifying liquid decolorized in step (f) is passed through a second regeneration step such that the adsorbed pigment is destroyed and the powdered activated carbon is regenerated, (K) a decolorizing step in which a part of the powdered activated carbon dye adsorbent regenerated in the second regeneration step is decolorized by adding the newly added powdered activated carbon and the added amount of the clarified liquid digested by the powdered activated carbon dye adsorbent regenerated in the second regeneration step ( e) a method of treating a high strength BOD-containing colored liquid, characterized in that consisting of the step of recycling. The method of claim 26, The regeneration step consists of wet oxidation or thermal treatment of the furnace in a controlled atmosphere. The method of claim 26, Wherein at least 25% of the powdered activated carbon used as the support medium and the pigment adsorbent consists of particles having a diameter of 0.01 to 0.3 mm. The method of claim 26, At least 25% of the powdered activated carbon used as the support medium and the pigment adsorbent consists of particles of 0.01 to 0.2 mm in diameter. The method of claim 26, characterized in that 0.1 to about 20 g / ι of powdered activated carbon is contained in the mixture of liquid, cells and powdered activated carbon of step (a). The method of claim 26, BOD 500 to 100,000mg / ι contained in the high-strength liquid. The method of claim 26, The high strength liquid is mixed and contacted with the cells and powdered activated carbon of step (a) for 4 to 48 hours. The method of claim 26, High strength liquid is mixed and contacted with the cells and powdered activated carbon of step (a) at a loading rate of 0.1 to 4.5 kg BOD / kg cells / day. The method of claim 26, A high strength BOD-containing liquid is produced from a heating process such as heat treatment or wet oxidation of sludge or industrial waste. The method of claim 26, the amount of soluble BOD removed in step (a) is greater than 50%. The method of claim 26, The amount of soluble BOD removed in step (a) is greater than 80%. The method of claim 26, the amount of soluble BOD removed in step (a) is greater than 90%. The method of claim 26, A process characterized in that the process is operated in a continuous or semi-continuous manner. (a) High strength BOD-containing colored liquid with virulent activated carbon support medium and the cells consisting of viable conditional acid-forming bacteria and methane-producing bacteria and almost all of the BOD removed in a gentle mixed anaerobic digestion atmosphere for 4 to 72 hours; Mixed and contacted with methane fuel gas to generate additional conditional acid-forming bacteria and methane producing bacteria, (b) separating and recovering fuel gas from the mixture of the digested liquid, cells and powdered activated carbon, (c) separating the digested cells and powdered activated carbon so that a sludge of the purified liquid and the cells and powdered activated carbon is formed; (d) a portion of the sludge is continuously or intermittently recycled to the mixing and contacting step (a) to treat an additional amount of high strength BOD containing colored liquid, (e) contacting the clarified liquid digested from step (c) with an additional amount of powdered activated carbon so that the digested clarified liquid decolorizes by adsorption of the pigment and formation of the used dye adsorbent, (f) separating the dye adsorbent used from the decolorized clarification liquid in the second clarification step, (g) discharging the decolorized clarifying liquid which has passed through the second clarification step to the natural environment or discharged for reuse or subsequent treatment, (h) a portion of the sludge from clarification step (c) is passed through a regeneration step in which the cells are destroyed and the powdered activated carbon in the sludge is regenerated, (i) passing at least a portion of the used dye adsorbent separated from the clarifying liquid decolorized in step (f) through the regeneration step (h) such that the adsorbed pigment is destroyed and the powdered activated carbon dye adsorbent is regenerated; , (j) at least a portion of the activated carbon recycled in step (i) is recycled to the anoxic mixing and contacting step (h) to treat the additional amount of high strength BOD-containing colored liquid. Method of treatment of liquids. The method of claim 39, and recirculating a portion of the powdered activated carbon regenerated in step (i) to the decolorizing step (e) which decolorizes the newly added powdered activated carbon and the liquid added amount clarified by the regenerated activated carbon. How to. The method of claim 39, The decolorizing step of washing a portion of the reclaimed powdered activated carbon with clean water to remove the pigment and decolorizing the washed carbon with an additional amount of the clarified liquid by the freshly added powdered activated carbon and the washed regenerated activated carbon ( e) recycling to. The method of claim 41, wherein The dye-containing washing water from the step of washing the regenerated powdered activated carbon is returned to the anoxic mixing and contacting step (a) to treat so that the adsorption capacity of the pigment contained therein can be increased. The method of claim 41, wherein Wherein the regenerating step consists of a wet oxidation or heat treatment step of furnace combustion. The method of claim 41, wherein At least 25% of the powdered activated carbon consists of particles of 0.01 to 0.3 mm in diameter. The method of claim 41, wherein Wherein at least 25% of the powdered activated carbon consists of particles of 0.01 to 0.2 mm in diameter. The method of claim 41, wherein characterized in that the mixture of liquid, cells and powdered activated carbon of step (a) contains 0.1 to about 20 g / ι of powdered activated carbon. The method of claim 41, wherein BOD 500 to 100,000 mg / l contained in the high-strength liquid. The method of claim 39, The high strength liquid is mixed and contacted with the cells and powdered activated carbon of step (a) for 4 to 48 hours. The method of claim 39, High strength liquid is mixed and contacted with the cells and powdered activated carbon of step (a) at a loading rate of 0.01 to 4.5 kg BOD / kg cells / day. The method of claim 39, A high strength BOD-containing liquid is produced from a heating process such as heat treatment or wet oxidation of sludge or industrial waste. The method of claim 39, the amount of soluble BOD removed in step (a) is greater than 50%. The method of claim 39, The amount of soluble BOD removed in step (a) is greater than 80%. The method of claim 39, the amount of soluble BOD removed in step (a) is greater than 90%. The method of claim 39, The amount of the pigment removed in step (e) is greater than 50%. The method of claim 39, and the amount of pigment removed in step (e) exceeds 80%. The method of claim 39, The amount of the pigment removed in step (e) is greater than 90%. The method of claim 39, A process characterized in that the process is operated continuously or semi-continuously. (a) Almost all of the BOD is removed from the high strength BOD-containing colored liquid with a powdered activated carbon support medium in a viable mixed anaerobic digestion atmosphere with cells consisting of viable conditional acid-forming bacteria and methane-producing bacteria for 4 to 72 hours. Mixed and contacted with methane fuel gas to generate additional conditional acid-forming bacteria and methanogenic bacteria, (b) separating and recovering fuel gas from the mixture of the digested liquid, cells and powdered activated carbon, (c) separating the cells and powdered activated carbon from the digested liquid to form sludges of the digested clarified liquid and the cells and powdered activated carbon; (d) a portion of the sludge is continuously or intermittently recycled to the mixing and contacting step (a) to treat an additional amount of high strength BOD containing colored liquid, (e) contacting the digested clarified liquid from step (c) with an additional amount of powdered activated carbon so that the digested clarified liquid is decolorized by adsorption of the pigment and formation of the used dye adsorbent, (f) separating the dye adsorbent used from the decolorized clarification liquid in the second clarification step, (g) discharging the decolorized clarifying liquid which has undergone the second clarification step into a natural environment or discharged for reuse or subsequent treatment, (j) adding some or all of the used color adsorbent from step (f) to the mixing and contacting step (a) to treat the addition of a high concentration of BOD-containing colored liquid. Method of treating high strength BOD-containing colored liquid. ※ Note: The disclosure is based on the initial application.